Key parameters at a glance

A radius of 3.44 Earth radii
A mass of 9.50 Earth masses
Surface gravity around 0.80 g
An orbital period of 10.916 days
Semi-major axis 0.0959 AU
Equilibrium temperature 758 K (485 °C)
Distance from Earth 1,229.16 light-years
Earth Similarity Index 0.285
Travel time at Voyager 1 speed 21,676,258 years

2 siblings around KOI-142

KOI-142 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
KOI-142 b this	Sub-Neptune	3.44	9.50	10.916	758	2013
KOI-142 c	Gas Giant	14.00	214.10	22.265	—	2013
Kepler-88 d	Gas Giant	13.10	965.15	1,403.000	—	2020

KOI-142 b Planet Profile

Physical Specs

Radius

3.44 R⊕

Radius (Jupiter)

0.307 R♃

Mass

9.50 M⊕

Mass (Jupiter)

0.030 M♃

Density

1.29 g/cm³

Surface Gravity

0.80 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.285

HZ Position Inner

Controversial No

Discovery

Year 2013

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#202of 1978

top 10.2%

This planet

3.44R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-25 b 3.44 R⊕ Kepler-223 c 3.44 R⊕ TOI-1723 b 3.44 R⊕

Metric	Earth	KOI-142 b	Jupiter
Radius (R⊕)	1.00	3.44	11.21
Mass (M⊕)	1.00	9.50	317.83
Density (g/cm³)	5.51	1.29	1.33
Surface Gravity (g)	1.00	0.80	2.53
Insolation (S⊕)	1.00	68.56	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.500 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	11.357 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 122712595

Gaia DR2

Gaia DR2 2101507367429089664

Gaia DR3

Gaia DR3 2101507367429089664

System

KOI-142

Percentile among Sub-Neptune cohort

Radius 3.438 R⊕ · percentile 90 / cohort 1978

Mass 9.500 M⊕ · percentile 69 / cohort 1978

Orbital period 10.92 d · percentile 38 / cohort 1946

Distance 376.86 pc · percentile 40 / cohort 1975

ESI 0.285 · percentile 24 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.916 days

Semi-major axis

0.0959 AU

Eccentricity

0.056

Inclination

90.97 °

Year Length

A year here lasts approximately 10.92 Earth days (3.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0959 AU.

Transit Fingerprint

Depth

0.148 %

Duration

3.650 h

Impact parameter b

0.372

Rp / R★

0.035150

Transit midpoint (BJD)

2,454,966.0092

Photometric dip

Transit produces a flux drop of 1,479 ppm lasting ≈ 3.65 h.

Extended Orbital Architecture

Planet / star radius ratio

0.035150

Semi-major axis / stellar radius

24.800

Impact parameter (b)

0.372

RV semi-amplitude (K)

2.700 m/s

Transit mid-time (BJD)

2,454,966.0092

Long. of periastron (ω)

90.59°

Angular separation (arcsec)

0.25400

Eq. Temperature

758K

(485 °C)

Insolation (S⊕)

68.56

Earth = 1.00

Earth Similarity (ESI)

0.285

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Nesvorny et al. 2013

Instrument

Kepler CCD Array

Publication

2013-11

Observation locale

Space

Discovery cohort

Planets confirmed in 2013 at Kepler (12 shown).

Kepler-69 c · Super-Earth Kepler-61 b · Sub-Neptune Kepler-62 e · Super-Earth KOI-351 f · Sub-Neptune Kepler-62 f · Super-Earth KOI-351 e · Sub-Neptune Kepler-1704 b · Gas Giant Kepler-37 d · Sub-Neptune Kepler-282 e · Sub-Neptune KOI-351 h · Gas Giant KOI-351 d · Sub-Neptune Kepler-114 c · Super-Earth

Host System: KOI-142

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,466 K — cooler than the Sun (5,778 K)

Estimated Age

1.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.897 R☉

Stellar Mass

0.990 M☉

Metallicity [Fe/H]

0.27

Extended Stellar Properties

Surface gravity (log g)

4.528 dex

Stellar density

1.340 g/cm³

Systemic radial velocity

-20.45 km/s

Rotational v·sin i

1.80 km/s

Metallicity ratio

[Fe/H]

Distance

376.86 parsec

Light-years 1,229.16 ly

V-band magnitude

13.21 mag

Voyager-speed travel 21,676,258 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.625 mas

Total Proper Motion

5.086 mas/yr

PM Right Ascension

1.11 mas/yr

PM Declination

4.96 mas/yr

Galactic Cartesian (pc)

x = 0.274 · y = -0.707 · z = 0.652

Equatorial (J2000)

RA 291.14810° · Dec 40.66941°

Galactic ℓ, b

72.935° · 11.528°

Ecliptic λ, β

305.066° · 61.559°

HTM-20 index

1617973644